[cns3xxx]: move PCIe init to subsys init call

[cns3xxx]: move PCIe init to subsys init call

ARM Linux PCI/PCIe hardware intialization needs to occur before device_init
as it does not support hotplug.  I have modeled the cns3xxx PCIe init after
other ARM platforms.  Registering it early resolves resource issues occuring
during bus enumeration that occur when a device driver is linked static in
the kernel.

Instead of passing in a bitmask to enable the 2 available ports, link detect
is used to enable ports that have a valid link.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
SVN-Revision: 34044